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- Have you passed the vendor command with the request 0xBB before reading data from the FX3?
- Is there any error code returned on the cyusb_bulk_transfer() function call? If yes, please mention the same.
- Before using the cyusb_bulk_transfer() function call, have you obtained the handle to the device, checked if the kernel driver is active and claimed the interface using the cyusb_gethandle(), cyusb_kernel_driver_active() and cyusb_claim_interface() function calls respectively.
EDIT: For reading data from the FPGA over to the USB interface, the slave interface must be configured and the SLWR#, ADR[1:0], PCLK must be driven by the FPGA(master). If there is no signalling on the GPIF II interface, the FPGA code has to be checked. The cyusb_bulk_transfer() function call on the IN endpoint reads the data that is present in the FX3 FIFO buffer.